Erika, while a mud roof might look cute, it's got to be engineered right. We just had a horrifying downpour for 3 days, and I've got conventional buildings, and things were leaking where they've never leaked before. You can't do anything at that point to try to save things if they aren't put together right. Or if there is a snow load, it's way better to make a rustic wooden roof with eaves that protect those walls. It's very, very dangerous to have such a structure just made out of chicken wire and mud, because there's very little structural integrity there. You might also look at how they made the California Missions, they all have wooden roofs. The standard homemade clay/straw bricks must be in the sun, no rain or dew on them, turned regularly for 30 days before using.
Pakanohida, yes, I saw all the You Tube pieces on those cob houses, and it's inspiring, although I am trying to have less and less maintenance, and I'm afraid those darling little things need maintenance more than one might realize.
"Life flows on within you and without you"...George Harrison
Coastal California, USA, Mediterranean climate - no summer rain, a little frost mid-winter